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Allowance for Loan and Lease Losses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and written loan commitments at fair value under the fair value option $ 1,078,465   $ 1,131,111  
Loan held for sale 9,086   12,918  
Loans guaranteed by U.S. Government Agencies 7,556,647   7,431,936  
Allowance for loan leases 66,767 $ 61,128 64,642 $ 57,200
Net reversal of provision 628 767    
Unfunded loan commitment        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Reserve for unfunded loan commitments 500   500  
(Impairment) improvement of ASC 310-30 loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans guaranteed by U.S. Government Agencies 123,408   129,531  
Allowance for loan leases 1,763   1,679  
Net reversal of provision 100 $ 200    
Loans Guaranteed by US Government Authorities        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans guaranteed by U.S. Government Agencies $ 148,500   $ 120,000